TD5 Defender Engine Management System Details
ENGINE MANAGEMENT SYSTEM
5
DESCRIPTION AND OPERATION
DESCRIPTION
General
An engine control module (ECM) controls the five cylinder direct injection diesel engine, and works on the drive by
wire principal. This means there is no throttle cable, the ECM controls the drivers needs via a signal from the
Throttle Position (TP) sensor on the throttle pedal.
The ECM is a full authoritative diesel specific microprocessor that also incorporates features for air conditioning. In
addition, the ECM supplies output control for the Exhaust Gas Recirculation (EGR) and turbocharger boost
pressure. The ECM has a self diagnostic function, which is able to provide backup strategies for most sensor
failures.
The ECM processes information from the following input sources:
•
Mass Air Flow (MAF) sensor.
•
Ambient Air Pressure (AAP) sensor.
•
Manifold Absolute Pressure (MAP) / Inlet Air Temperature (IAT) sensor.
•
Engine Coolant Temperature (ECT) sensor.
•
Crankshaft Speed and Position (CKP) sensor.
•
Throttle Position (TP) sensor.
•
Fuel Temperature (FT) sensor.
•
Air conditioning request.
•
Air conditioning fan request.
•
Brake pedal switch.
•
Clutch pedal switch.
The input from the sensors constantly updates the ECM with the current operating condition of the engine. Once
the ECM has compared current information with stored information within its memory, it can make any adjustment
it requires to the operation of the engine via the following:
•
Air conditioning clutch relay.
•
Air conditioning cooling fan relay.
•
Electronic vacuum regulator solenoid.
•
Fuel pump relay.
•
Glow plug warning lamp.
•
Glow plugs.
•
Fuel injectors.
•
Main relay.
•
Turbocharger wastegate modulator.
•
Temperature gauge.
The ECM interfaces with the following:
•
Serial communication link.
•
Instrument pack.